Brushless dc motor controller of motor controller itself is electromechanical energy conversion part, it besides the armature, permanent magnet motor controller excitation two points, also with sensors. Motor controller itself is the core of the brushless dc motor controller, it is not only related to the performance index, noise, vibration, reliability and service life, etc. , involving the manufacturing costs and product cost. Because use permanent magnet magnetic field, make the brushless dc motor controller get rid of the traditional design of general dc motor controller and structure, meet the requirements of various applications market, and development in the direction of the province copper material saving, simple and convenient manufacturing. Permanent magnet magnetic field is closely related to the development and application of permanent magnetic material, the third generation of the application of permanent magnetic material, make brushless dc motor controller to efficiency, miniaturization, energy-saving direction. Brushless dc motor controller is a kind of synchronous motor controller, the rotor speed of the motor controller that is motor controller speed rotating magnetic field of the stator and rotor pole (p)Effect: n = 120. f / p。 In case the number of rotor fixed, change the frequency of the stator rotating magnetic field can change the speed of the rotor. Brushless dc motor controller is the synchronous motor controller combined with electronic control (Drive), control the frequency of the stator rotating magnetic field and the motor controller of rotor speed feedback to the control center again, in order to approach to achieve dc motor controller features. That is brushless dc motor controller can be within the rated load when the load changes can still maintain control motor controller rotor speed.
